Colour design now covers cluster lighting to an increasing extent, notably in combined instruments such as speedometers and rev counters, in displays, as backlighting for switches and for ambient lighting.
The main feature of the new MultiLED, in its standard 3.3 x 3.0 x 1.8 mm SMT package, is a very broad blue colour range with a wavelength of up to 447 nm at high brightness, which allows the production of deep saturated blue tones. This is due to the use of three LED chips in red, green and blue (RGB). At 370 mcd the blue is very bright. This brightness is a huge advantage as the human eye perceives the colour blue darker than it really is and the new MultiLED can offset this perception. Other properties of the MultiLED are an integrated ESD protective diode, an improved corrosion resistance and a long market availability, which makes them ideal for use in cars.
The three independently controllable LED chips in red, green and blue are available in different brightness groups thanks to finely defined grouping (binning). They can be individually combined to produce a large colour spectrum. All three chip colours are the product of state-of-the-art-technology: Blue and green in UX:3 technology, red in the latest thin-film technology. The light is therefore extracted from the chip with high efficiency, which leads to high luminous intensity: Red comes with 750 mcd, blue with 370 mcd and green with 1630 mcd. In the upper blue wavelength range, a figure of up to 560 mcd is achieved at an operating current of 20 mA. The typical thermal resistance between the chip and the solder point is 127 K/W for blue and green and 96 K/W for red.
Osram via Rutronik: www.rutronik.com